More flexible ca_path

[gregburek]

I found some documentation around using set_default_paths to allow for delegation to the OS for where the root ca's are. (From: http://mislav.uniqpath.com/2013/07/ruby-openssl/)

``
http.cert_store = OpenSSL::X509::Store.new
http.cert_store.set_default_paths

What do you think?

[jamesbouressa]

I am confused why the pagerduty gem should assume that the SSL defaults on a host are broken.

If the local ruby is broken, then the user should be able to use the various SSL_CERT_XXX env vars to fix themselves up.

Same with setting verify_mode. I would leave that up to the user of the gem.

[orien]

Net::HTTP will take the OpenSSL defaults if we don't set anything. The gem will be much more flexible/usable across multiple systems if we don't set the ca_path attribute.